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Given a topic, provide five interesting facts about it.

Tropical Rainforest


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1. Tropical rainforests cover about 6% of the Earth's land surface. 
2. Tropical rainforests are home to over half of the world's species of plants and animals. 
3. They are some of the world’s oldest and richest ecosystems. 
4. Tropical rainforests produce over 30% of the oxygen in the Earth's atmosphere. 
5. Tropical rainforests are threatened by deforestation, and it has been estimated that they will be completely destroyed within the next 100 years.